Magneto-phonon resonance in graphene

ORAL

Abstract

Recently, much attention has been paid to electron-phonon coupling in graphene. In particular, significant re-normalization and broadening of long-wavelength optical phonons are predicted to occur through resonant interaction with Landau-quantized Dirac fermions. We report a high-field magneto-Raman spectroscopy study of single-layer graphene in magnetic fields up to 45 T. The Raman G peak exhibits clear splitting at approximately 30 T, which we attribute to the fundamental magneto-phonon resonance associated with (0,1) inter Landau level transitions. The coupled electron-phonon modes exhibit characteristic anti-crossing behavior allowing for an accurate determination of the electron-phonon coupling strength in graphene.

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Authors

  • Younghee Kim

    • National High Magnetic Field Laboratory, Tallahassee, FL 32310, USA

  • J.-M. Poumirol

    • National High Magnetic Field Laboratory, Tallahassee, FL 32310, USA

  • A. Lombardo

    • Engineering Department, Cambridge University, Cambridge, CB3 0FA, UK

  • N.G. Kalugin

    • Department of Materials and Metallurgical Engineering, New Mexico Tech, Socorro, NM 87801, USA

  • J. Kono

    • Department of Electrical \& Computer Engineering, Rice University, Houston, TX 77005, USA

  • T. Georgiou

    • School of Physics \& Astronomy, University of Manchester, Oxford Road, Manchester M13 9PL, UK

  • A.K. Geim

    • School of Physics \& Astronomy, University of Manchester, Oxford Road, Manchester M13 9PL, UK

  • K.S. Novoselov

    • School of Physics \& Astronomy, University of Manchester, Oxford Road, Manchester M13 9PL, UK

  • A.C. Ferrari

    • Engineering Department, Cambridge University, Cambridge, CB3 0FA, UK

  • D. Smirnov

    • National High Magnetic Field Laboratory, Tallahassee, FL 32310, USA